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Originally Posted by kweller
...validate the database? By which I mean check that everything which is in the database actually exists on the HDD and ensure the database itself is consistent.
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Not as far as I know.
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...inspect a book using Calibre without adding it to the library? I know I could add it to the library then delete it afterwards if necessary but I was wondering if I can skip the add/delete step and just look at the book details, view it etc.
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Not as far as I know
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...delete one or more formats of a book? e.g. if I have a book in PRC, PDF and LRF formats just delete, say, the pdf.
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This is done via the Edit metadata dialogs.
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...use Calibre in multi-user mode? Our eBook library is stored on a NAS and I'm currently running Calibre just on my machine. SWMBO also has a reader and it would be useful if she could run Calibre on her machine against the same database.
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This is one I am not sure off. I store my database on my NAS, but I am never updating from more than one system at a time.
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Where is the metadata stored, in the database or in the eBook file itself? (I suspect the answer is some and some)
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The metadata is primarily stored in the metadata.db file. However items like cover art are store as free-standing files.
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If I want to back-up the Calibre database am I correct in assuming all I need to backup is metadata.db?
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No - you should be backing up everything in the Calibre library folder.
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Is it possible to persuade Calibre to pre-populate the metadata for a bulk edit where the data for all the files to be edited is consistent? I'm thinking of a situation where, for several books, I have made a typo in an author's name or the sort sequence is wrong. I realise I can retype it but if all I need to do is make a small edit to the existing data it would be easier if the bulk editor presented consistent existing data.
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Yes - simply highlight the files concerned and select the option to Edit metadata option.
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And finally, I'll be grateful if someone will recommend a piece of software which I could use to run queries against the Calibre database and/or export the data from within it.
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I use sqliteman (which is free).